<regex>: Fix depth-first and leftmost-longest matching rules - #5218

<regex>: Fix depth-first and leftmost-longest matching rules#5218

Stephan T. Lavavej (StephanTLavavej) merged 16 commits into

microsoft:mainmicrosoft/STL:mainfrom

muellerj2:regex-fix-matching-strategiesmuellerj2/STL:regex-fix-matching-strategiesCopy head branch name to clipboard